
If you have just installed a refilled, remanufactured or compatible HP 940 or HP 940XL it is likely that it uses a HP original chip to identify itself to the printer. These chips use a combination of counting pages and average page coverage to estimate the amount of ink inside the cartridge. As they have no way to check the physical ink level in a cartridge, a chip that has been used previously will almost certainly warn of having low ink or even being empty once installed. The message should look...